列车轴质量和土工格室加固道砟对路基沉降的影响OACSTPCD

A 3-dimensional finite element model and a geocell model of ballast subgrade are established.The phase loads are used to simulate the train dynamic load.The influence of train axle mass and geocell reinforce-ment ballast on roadbed settlement is studied.The simulation results show that the displacement changes be-tween each sleeper are basically consistent under the action of sinusoidal phase load.With the increasing of the train axis mass,the ballast settlement increases obviously.After laying geocell reinforces,the lateral displace-ment and vertical settlement of ballast reduce by 60％and 11％,respectively.Under the heavy load condi-tions,the reinforcement efficiency of geogrid reduces,but the stiffness of geocell can change its reinforcement efficiency.When the stiffness of geocell is between 400-800 MPa,the reinforcement effect on heavy-load road-beds is favorable.